When I started my truck this morning it was only running 5 psi, but I thought that it would come up after it idles for a while. I let it warm up 5-10 min. and when I left it hadn't come up any. Then when I got going it came down to 0 psi. When I can to a stop sign pressure came back up to 13 psi but dropped to 10 psi when I started going again. I have noticed the pressure down a little lately but I just thought it was because of the cold. It is -9 here this morning and my low fuel light just came on. I haven't changed the filter yet this year either. I don't know if it is just the combination of the cold, low fuel, and maybe clogged fuel filter or if it is the pump. I didn't have this problem last year, but it didn't get this cold.

What do you guys think? Is it my FASS?

 

There is your clue FD, gelled fuel. You don't say anything about fuel additives. Are you running an anti-gel? If not you'll want to get a bottle of Power Service 911. It's in a red bottle. Follow directions. If it is still running you can get by with just adding it to the fuel tank. If not, you'll have to add it to the filter housing too.

After you get it going add Power Service (white bottle) each and every fill up.

 

I forgot to add that. I am runnig stanadyne at every fill up, but maybe I didn't add enough because it is really cold. That is what I was kindof thinking, the combo of really cold fuel and not much of it caused the psi to come down.

Thanks for the reply Geico266.

 

With the fuel pressure of zero I would not drive it until you add the 911. That VP-44 needs fuel.

 

It started at 0 psi but came up as I drove it. I think it was just the fuel being really cold.

 

I would also see how much fuel you have in your tank. If its been a while since you filled up, your sending unit might have stuck and you could be on fumes.......I have seen more than you would think........

BUT i would do the PS thing as well. UM......confirm your gauge is working correctly when it gets a tad warmer....but if you are in this winter blast like we are....it might be a while! haha....

 

my fuel pressure was slightly lower than normal a couple weeks ago and i thought it was because of the cold. I checked my pressure manually at the VP44 and i was getting 14 psi which was normal, however my gauge read 11-12. I opened up my isolator and the antifreeze was low. My specs that came with my gauge said that the antifreeze was supposed to be up to the second from top thread, and it wasnt. Check to see if you are low.

 

I have had this problem before, MINE was a bad tank of fuel. hince water in fuel would Ice up the fuel filter. causeing the fuel pressure to drop to zero. and I had 16 + psi pre filter. it was -2 degrees out -30 with wind chill and I changed the filter then it did it agin 20 miles down the road . only thing that did it was a bottle of red diesel 911. well hope the info helps .

 

fox man you have the technology. haha. How's that generator??
I just got one and it is the cat's meow. It was -17 F Sat and it ran 9 hours on 3 gal of gas. (burn that gass up haha) I had heat in about a mile. I need a fuel heater now and I'll be able to go anywhere. I even carry a heavy duty metal heat gun to blow on the filter housing if necessary now that I have power..

The water in the fuel is a bad deal. I got it last year...same deal -10 out on the highway. Good thing I had a couple filters along.

I

 

Well my generator has electric start. ans it also is a bit hesatent to start at anything below 0 degrees out. it has a bad realy that stick when it's cold so it gets no power to the coil. will fix that when it gets warmer out.but heck it's only 40 some thing years old can't see why it would go bad. As for the pre heater for the generator I have a magneticc heater on the oil pan for it 200 watt. 120ac , if I know that I will need it I will plug the preheater into the power inverter as I drive then turn it on when I get where I am going. ya I use about 6 gallons of gas every week and a half running it 4 hours a night. I also have a small space heater that I leave on it the cab A 500 watt under the seat, takes a bit of the chill off the leather, I will never get leather seats agin. well looks like I might have hijacked the topic with this one. take it easy . Cole

 

When I left yesterday I had good pressure, about 13 psi cruising. I filled up and put power service in the tank. Everything looked good. Well, it was -7 when I came in this morning. I had good pressure when then engine started up, 14 psi, but when the grid heater kicked in the pressure started to drop. It went down to 5 psi idling. The high idle kicked in and psi came up to 8 psi. When I kicked the high idle off pressure came up to 11 psi so I thought that I would be OK. When I started going the pressure started to drop and it went down to 4 psi cruising. When I would stop it would come back up to 11 psi. Now I am wondering if it is the FASS pump because of the pressure drop when the grid heater coming on. Doe anyone have an idea?

 

Check your connections at the relay, FASS, Fuse, BATT, etc. Make sure you have NO corrosion in any of them. Its strange that a 2nd gen heaters will pull your FASS down....usally its a 3rd gen deal.

But like i stated before, make sure your gauge is working correctly in this cold weather as well.

 

My gauge is working fine. I have it "T"ed into the fuel line with no isolator. Why would it work fine yesterday afternoon and not in the morning? I have another gauge I could use to check with though.

And the connection could make sense, but why would it only do it when it is cold?

How would I know if it is the pump going bad?

 

-7*F and diesel sitting in the gauge line and gauge might make it act funny until you get some heat in the cab (#2 starts to gels at 10*F). The fuel in the line and gauge might not have any additive in it since its a closed sytem off the main line........BUT i have personaly, never felt, been in or seen anything below 0* (Trip to Iowa a few years back) with a diesel....so this cold winter thing is slightly new to me here in MO.......i know....dang Texan...haha...

Pump as in VP-44 or FASS?

 

[QUOTE=Diesel-Dan;1341018]The fuel in the line and gauge might not have any additive in it since its a closed sytem off the main line

Pump as in VP-44 or FASS?[QUOTE]

Pump as in FASS. I want to get it fixed if it is bad before my vp44 goes bad.

Why would I have good pressure when I start up and then it goes down. I don't think that it would be the fuel in the line to the gauge is gelling, but I don't know.